linux-kernel - Re: [PATCH] perf_counter: tools: Rework event parsing

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Date:	Wed, 1 Jul 2009 10:24:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] perf_counter: tools: Rework event parsing


* Paul Mackerras <paulus@...ba.org> wrote:

> This reworks the parser for event descriptors to make it more
> consistent in what it accepts.  It is now structured as a recursive
> descent parser for the following grammar:
> 
> events		::= event ( ("," | space) space* event )*
> event		::= ( raw_event | numeric_event | symbolic_event |
> 		      generic_hw_event ) [ event_modifier ]
> raw_event	::= "r" hex_number
> numeric_event	::= number ":" number
> number		::= decimal_number | "0x" hex_number | "0" octal_number
> symbolic_event	::= string_from_event_symbols_array
> generic_hw_event::= cache_type ( "-" ( cache_op | cache_result ) )*
> event_modifier	::= ":" ( "u" | "k" | "h" )+

Very nice changes, thanks Paul!

	Ingo
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